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Site-dependent effects of tDCS uncover dissociations in the communication network underlying the processing of visual search.

Ball, K. and Lane, A. R. and Smith, D. T. and Ellison, A. (2013) 'Site-dependent effects of tDCS uncover dissociations in the communication network underlying the processing of visual search.', Brain stimulation., 6 (6). pp. 959-965.


Background: The right posterior parietal cortex (rPPC) and the right frontal eye field (rFEF) form part of a network of brain areas involved in orienting spatial attention. Previous studies using transcranial magnetic stimulation (TMS) have demonstrated that both areas are critically involved in the processing of conjunction visual search tasks, since stimulation of these sites disrupts performance. Objective: This study investigated the effects of long term neuronal modulation to rPPC and rFEF using transcranial direct current stimulation (tDCS) with the aim of uncovering sharing of these resources in the processing of conjunction visual search tasks. Methods: Participants completed four blocks of conjunction search trials over the course of 45 min. Following the first block they received 15 min of either cathodal or anodal stimulation to rPPC or rFEF, or sham stimulation. Results: A significant interaction between block and stimulation condition was found, indicating that tDCS caused different effects according to the site (rPPC or rFEF) and type of stimulation (cathodal, anodal, or sham). Practice resulted in a significant reduction in reaction time across the four blocks in all conditions except when cathodal tDCS was applied to rPPC. Conclusions: The effects of cathodal tDCS over rPPC are subtler than those seen with TMS, and no effect of tDCS was evident at rFEF. This suggests that rFEF has a more transient role than rPPC in the processing of conjunction visual search and is robust to longer-term methods of neuro-disruption. Our results may be explained within the framework of functional connectivity between these, and other, areas.

Item Type:Article
Keywords:Conjunction search, Posterior parietal cortex, Frontal eye fields, Spatial attention, Transcranial direct current stimulation.
Full text:(AM) Accepted Manuscript
Available under License - Creative Commons Attribution Non-commercial No Derivatives.
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Publisher statement:© 2013 This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Date accepted:01 June 2013
Date deposited:02 December 2015
Date of first online publication:November 2013
Date first made open access:No date available

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